Former district attorney Rob Wallace (D) and plumbing company owner Markwayne Mullin (R) will face off this November in the 2nd district.

Wallace defeated a well-funded seed company owner, Wayne Herriman, for the Democratic nod, 57 percent to 43 percent. Mullin defeated state Rep. George Faught, 57 percent to 43 percent, to become the GOP nominee, according to unofficial results from the Oklahoma Secretary of State.

This marks the second time both pairs of candidates have run against each other. Neither candidate won enough support in the June 26 primary to avoid today's runoff.

Their victories set up the race for retiring Democratic Rep. Dan Boren's "Little Dixie" seat in eastern Oklahoma. Roll Call rates the seat as Leans Republican.

The 2nd district overwhelmingly supported Sen. John McCain (R-Ariz.) for the national ticket in 2008. But Boren always won re-election by a comfortable margin.